1131430221 has 32 divisors (see below), whose sum is σ = 1773440000. Its totient is φ = 710932464.

The previous prime is 1131430169. The next prime is 1131430231. The reversal of 1131430221 is 1220341311.

1131430221 is a `hidden beast` number, since 1 + 13 + 1 + 430 + 221 = 666.

It is not a de Polignac number, because 1131430221 - 2⁹ = 1131429709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1131430194 and 1131430203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131430231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96546 + ... + 107628.

It is an arithmetic number, because the mean of its divisors is an integer number (55420000).

Almost surely, 2^1131430221 is an apocalyptic number.

It is an amenable number.

1131430221 is a deficient number, since it is larger than the sum of its proper divisors (642009779).

1131430221 is a wasteful number, since it uses less digits than its factorization.

1131430221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11310 (or 11304 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1131430221 is about 33636.7391552748. The cubic root of 1131430221 is about 1042.0196886826.

Adding to 1131430221 its reverse (1220341311), we get a palindrome (2351771532).

The spelling of 1131430221 in words is "one billion, one hundred thirty-one million, four hundred thirty thousand, two hundred twenty-one".